WO2003069225A1 - Emetteur de rayons infrarouges sous la forme d'un emetteur plan - Google Patents

Emetteur de rayons infrarouges sous la forme d'un emetteur plan Download PDF

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Publication number
WO2003069225A1
WO2003069225A1 PCT/DE2003/000401 DE0300401W WO03069225A1 WO 2003069225 A1 WO2003069225 A1 WO 2003069225A1 DE 0300401 W DE0300401 W DE 0300401W WO 03069225 A1 WO03069225 A1 WO 03069225A1
Authority
WO
WIPO (PCT)
Prior art keywords
infrared radiator
radiator according
channels
combustion chamber
nozzles
Prior art date
Application number
PCT/DE2003/000401
Other languages
German (de)
English (en)
Inventor
Richard Aust
Juan Paniagua
Original Assignee
Voith Paper Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10222452A external-priority patent/DE10222452A1/de
Application filed by Voith Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Priority to CA002475955A priority Critical patent/CA2475955A1/fr
Priority to EP03708022A priority patent/EP1476696A1/fr
Publication of WO2003069225A1 publication Critical patent/WO2003069225A1/fr
Priority to US10/916,100 priority patent/US7011516B2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/147—Radiant burners using screens or perforated plates with perforated plates as radiation intensifying means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/102—Flame diffusing means using perforated plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/10—Burner material specifications ceramic

Definitions

  • Infrared heater designed as a surface heater
  • the invention relates to an infrared radiator designed as a surface radiator with a combustion chamber which is delimited on the one hand by a gas-permeable barrier and on the other hand by a radiator, the radiator containing a plurality of channels and emitting infrared radiation on its front surface.
  • Infrared emitters designed as surface emitters are known to be used in dryer systems which are used to dry sheet-like materials, for example paper or cardboard sheets. Depending on the width of the web to be dried and the desired heating output, the required number of emitters with aligned radiation surfaces is put together to form a drying unit.
  • FIG. 8 The basic structure of an individual generic infrared radiator is shown in FIG. 8 and described, for example, in DE 199 01 145-A1.
  • the fuel / air mixture required for the operation of the radiator is fed to the radiator through an opening (a) in the housing (b) and first reaches a distribution chamber
  • the main task of the barrier (d) is to separate the combustion chamber (e) in which the gas is burned from the distribution chamber (c), in which the unburned gas mixture is located, so that no flashback occurs from the combustion chamber (e) after
  • the barrier (d) is sensibly designed so that the best possible heat transfer of the hot combustion exhaust gases to the radiation-emitting solid body, i.e. the surface of the barrier (d) itself, possibly the walls of the combustion chamber (e) and the actual one Radiant body (f) is prepared.
  • a further generic infrared radiator is known from US Pat. No. 3,751, 213, in which the radiating body consists of a honeycomb body with through holes for removing the combustion gases.
  • the barrier ("gas injection block") is designed as a perforated ceramic plate.
  • the main advantage of the honeycomb body described in the patent is that the holes contained therein act as black emitters if their length / diameter ratio exceeds 5.
  • the openings in the blasting body must have a certain minimum area in order to ensure rapid ignition of the gas-lifting infrared emitters of the drying unit.
  • the minimum diameter is approx. 4 mm. Given the specified length / diameter ratio, this requirement results in a minimum height of the honeycomb structure of 20 mm and thus a comparatively large mass to be heated.
  • the relatively large openings in the radiator which are required to ignite the radiator, lead to relatively low gas velocities and thus to a comparatively poor convective heat transfer from the combustion exhaust gases to the radiator.
  • no material is currently known that enables the construction of a barrier in the form described in US Pat. No. 3,751,213 and at the same time withstands the very high combustion chamber temperatures which are typical for this construction for a long time.
  • the invention is therefore based on the object of providing a generic infrared radiator which has improved convective heat transfer with a long service life.
  • the barrier consists of a single nozzle plate and the channels of the jet body on the combustion chamber side are closed at least in the area of the outlet openings of the nozzles, thereby forming baffles against which the outlet openings of the nozzles are directed.
  • the nozzles as through openings result in a high exit speed, which is the basis for efficient, convective heat transfer.
  • the baffles prevent the flame from forming due to the high speed only within the radiator and thus there is insufficient heat transfer to it.
  • the baffles in connection with the nozzle field of the nozzle plate result in maximum convective heat transfer.
  • FIG. 1 shows a cross section through the structure of an infrared radiator according to the invention
  • FIG. 2 shows a plan view of the combustion chamber side of the radiator body according to FIG. 1,
  • FIG. 3 shows a cross section through the radiant body according to FIG. 2,
  • FIG. 4 and FIG. 5 each show a top view of the firebox side of two other embodiments of a radiator
  • FIG. 6 and FIG. 7 each show a view of the radiating front side of radiators made up of individual strips
  • FIG. 8 shows a cross-section of the basic structure of an emitter housing.
  • the infrared radiators according to the invention are preferably heated with gas, alternatively heating with a liquid fuel as the heating fluid is possible.
  • each radiator contains a mixing tube 1, into which a mixing nozzle 2 is screwed at one end.
  • a gas supply line 3 is connected to the mixing nozzle 2 and is connected to a manifold 4 from which a plurality of radiators arranged next to one another are supplied with gas 5.
  • the supply of air 6 takes place via a hollow cross member 7, to which the mixing tube 1 is attached.
  • the connecting line 8 for the air supply opens into the upper part of the mixing tube 1 into a downwardly open air chamber 9 comprising the outlet end of the mixing nozzle 2, so that a gas-air mixture is introduced into the mixing space 10 of the mixing tube 1 from above.
  • a housing 11 is fastened, in which a nozzle plate 12 is arranged as a barrier.
  • the nozzle plate 12 is made of a heat-resistant metal and contains a series of tubular nozzles 29, which are also made of metal.
  • the nozzles 29 open into a combustion chamber 14 which is delimited on the one hand by the nozzle plate 12 and on the other hand by a jet body 15 which is arranged essentially parallel to it and at a distance. Flames form in the combustion chamber 14, which heat the radiant body 15 from the rear, so that it emits infrared radiation.
  • the nozzles 29 are embedded in a vacuum-shaped plate 30, which is formed from high-temperature-resistant ceramic fibers. Alternatively, the plate can be replaced with several layers of ceramic paper.
  • the plate 30 acts as an insulating layer for the nozzle plate 12 and thus, apart from flashbacks, prevents it from being damaged by the high temperatures in the combustion chamber 14.
  • This combined construction consisting of a metallic nozzle plate and ceramic fiber insulation, is much more resistant to cracking than the known perforated ceramic plates, which are often used as a barrier.
  • the diameter of a nozzle 29 is 1.5-4 mm, the nozzle plate 12 containing approximately 1500-2500 nozzles 29 per m 2 of its area.
  • the mixing tube 1 opens into a distribution chamber 17 sealed by a hood 16, which is closed at the other end by the nozzle plate 12. So that the gas-air mixture is evenly distributed on the back of the nozzle plate 12, a baffle plate 18 is arranged in the distribution chamber 17, against which the supplied mixture flows.
  • the nozzle plate 12 is fitted in the housing 11 in circumferential, fire-proof seals 19.
  • the radiator 15 hangs in a circumferential refractory frame 20 which is attached to the housing 11 or is part of it and, together with the seals 19, seals the combustion chamber 14 laterally in a gastight manner.
  • the radiant body 15 is made of ceramic or another highly heat-resistant material. It is preferably made from a suitable SiC modification or a material which contains more than 50% by weight of a metal silicide as the main component. Molybdenum disilicide (MoSi 2 ) or tungsten disilicide (WSi 2 ) are preferably used as metal silicides. Silicon oxide (SiO 2 ), zirconium oxide (ZrO 2 ) or silicon carbide (SiC) are preferably contained as further constituents. These materials are extremely temperature-resistant and stable, so that the heater - if necessary - with flame temperatures of more than 1700 ° C up to 1850 ° C can be operated.
  • the material Compared to an alloy which is also resistant to high temperatures and which consists exclusively of metals (for example a metallic heat conductor alloy), the material has the further advantage that almost no scaling occurs.
  • a flame temperature slightly below the maximum possible temperature of the radiator body 15 for example between 1100 ° C and 1400 ° C, whereby the formation of thermal NO x is kept within an acceptable range.
  • the radiant body contains a multiplicity of channels 21 which, as shown in FIGS. 1 and 3, extend outward from the combustion chamber 14.
  • the channels 21 are heated on the rear side of the jet body 15 which delimits the combustion chamber 14.
  • the channels 21 are open at the front of the radiating body 15, where they emit the infrared radiation.
  • the cross section of the tubular channels 21 is preferably either circular or in the form of a regular polygon, for example the channels 21 are arranged side by side in a honeycomb shape.
  • the channels 21 of the jet body on the combustion chamber side are closed at least in the area of the outlet openings of the nozzles 29.
  • Baffles 22 are thus formed, against which outlet openings of the nozzles 29 are directed.
  • the baffles 22 ensure that the flames already form in the combustion chamber 14 and not only within the channels 21. This results in maximum convective heat transfer.
  • FIGS. 2 to 5 show different embodiments of a blasting body 15 made from a block.
  • the channels 21 in the region of the outlet openings of the nozzles 29 are closed.
  • strip-shaped (FIG. 2, FIG. 4) or circular (FIG. 5) plates 24 are applied or incorporated into the surface of the blasting body 15 in the corresponding areas.
  • the plates preferably consist of the same refractory material from which the rest of the blasting body 15 is made. So it is possible at Manufacture of the jet body 15 from a uniform material in the corresponding areas to design the channels 21 closed.
  • the jet body 15 is constructed from individual, bar-shaped elements 25 arranged next to one another, each of which is fastened in the frame 20 with its ends.
  • Each of the elements 25 contains a plurality of channels 21 which are closed in the manner described above on the combustion chamber side and are open on the front side of the radiator shown in FIGS. 6 and 7. Between the individual elements 25 there are openings 23 which allow the combustion exhaust gases to be removed from the combustion chamber 14.
  • narrow slots are present as openings 23 between the individual elements 25. At least one slot 23 a of the radiator is made wider so that the radiator can be ignited from the outside. For this purpose, the clear width of the slot 23 a is at least 4 mm.
  • a further bar-shaped element 26 is arranged between two bar-shaped elements 25, which has continuous channels 27 with an enlarged cross-section.
  • the combustion exhaust gases are discharged from the combustion chamber 14 through the continuous channels 27.
  • the diameter of the channels 27 is at least 4 mm, so that the radiator can also be ignited through these channels 27 from the outside.
  • the channels 21 of the elements 25 have a considerably smaller diameter. They are closed on the firebox side in the manner described above.
  • the infrared emitters according to the invention are particularly suitable for drying sheet-like materials at high web speeds.
  • a preferred area of application is the drying of running cardboard or paper webs in paper factories, for example behind coating devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

L'invention concerne un émetteur de rayons infrarouges se présentant sous la forme d'un émetteur plan, comprenant un foyer (14) qui est délimité, d'une part, par une barrière perméable aux gaz, et, d'autre part, par un corps rayonnant (15). Ce dernier contient une pluralité de canaux (21) et émet un rayonnement infrarouge au niveau de sa face avant. L'objectif de l'invention est de créer un émetteur de rayons infrarouges présentant un transfert de chaleur par convection amélioré et une grande durée de vie. A cet effet, la barrière est constituée d'une plaque à buses (12) présentant des buses individuelles (29) et les canaux (21) du corps rayonnant (15) sont fermés sur le côté foyer, au moins dans la zone des ouvertures de sortie des buses (29), ce qui permet de former des faces d'impact (22) vers lesquelles sont dirigées les ouvertures de sortie des buses (29).
PCT/DE2003/000401 2002-02-12 2003-02-11 Emetteur de rayons infrarouges sous la forme d'un emetteur plan WO2003069225A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002475955A CA2475955A1 (fr) 2002-02-12 2003-02-11 Emetteur de rayons infrarouges sous la forme d'un emetteur plan
EP03708022A EP1476696A1 (fr) 2002-02-12 2003-02-11 Emetteur de rayons infrarouges sous la forme d'un emetteur plan
US10/916,100 US7011516B2 (en) 2002-02-12 2004-08-11 Infrared radiator embodied as a surface radiator

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10205921 2002-02-12
DE10205921.7 2002-02-12
DE10222452A DE10222452A1 (de) 2002-02-12 2002-05-22 Als Flächenstrahler ausgebildeter Infrarot-Strahler
DE10222452.8 2002-05-22

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/916,100 Continuation US7011516B2 (en) 2002-02-12 2004-08-11 Infrared radiator embodied as a surface radiator

Publications (1)

Publication Number Publication Date
WO2003069225A1 true WO2003069225A1 (fr) 2003-08-21

Family

ID=27735668

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/000401 WO2003069225A1 (fr) 2002-02-12 2003-02-11 Emetteur de rayons infrarouges sous la forme d'un emetteur plan

Country Status (4)

Country Link
US (1) US7011516B2 (fr)
EP (1) EP1476696A1 (fr)
CA (1) CA2475955A1 (fr)
WO (1) WO2003069225A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009087126A2 (fr) * 2008-01-07 2009-07-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Corps thermorayonnant en céramique, sous forme de plaque, d'un émetteur plan infrarouge

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT504398B1 (de) * 2006-10-24 2008-07-15 Windhager Zentralheizung Techn Porenbrenner, sowie verfahren zum betrieb eines porenbrenners
CA2595752C (fr) * 2007-01-26 2014-07-22 Schwank Ltd. Generateur de chaleur a tube radiant
US7914904B2 (en) * 2008-03-25 2011-03-29 General Electric Company Component in a combustion system, and process for preventing slag, ash, and char buildup
WO2010003904A1 (fr) * 2008-07-08 2010-01-14 Nv Bekaert Sa Brûleur radiant amélioré
JP5507966B2 (ja) * 2009-11-09 2014-05-28 東邦瓦斯株式会社 燃焼プレート
CN102032556A (zh) * 2011-01-07 2011-04-27 扬州晨光特种设备有限公司 一种涡旋扩散燃烧锅炉
US20120301837A1 (en) * 2011-05-27 2012-11-29 Kazuyuki Akagi Plate type burner
US8568021B2 (en) 2011-09-29 2013-10-29 Schwank Ltd. Apparatus and method for measuring heat flux from radiant heater
US9080777B2 (en) 2012-01-31 2015-07-14 Schwank, Ltd. Reflector for radiant tube heater
JP2016084955A (ja) * 2014-10-24 2016-05-19 リンナイ株式会社 燃焼プレート
US11255538B2 (en) * 2015-02-09 2022-02-22 Gas Technology Institute Radiant infrared gas burner
CN108644770A (zh) * 2018-04-12 2018-10-12 上海蓝炽热能科技有限公司 逆向燃气红外辐射系统

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Publication number Priority date Publication date Assignee Title
US5249953A (en) * 1989-06-16 1993-10-05 Hercules Canada, Inc. Gas distributing and infrared radiating block assembly
DE29520108U1 (de) * 1995-12-19 1997-04-17 Robert Bosch Gmbh, 70469 Stuttgart Brenner für Heizgeräte
DE19901145A1 (de) * 1999-01-14 2000-07-20 Krieger Gmbh & Co Kg Als Flächenstrahler ausgebildeter Infrarot-Strahler
DE19928096A1 (de) * 1999-06-19 2000-12-21 Krieger Gmbh & Co Kg Gasbeheizter Infrarot-Strahler für eine Infrarot-Trocknungseinheit

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DE1233764B (de) 1961-10-11 1967-02-02 Samuel Ruben Verfahren zur Herstellung von hochschmelzenden, elektrisch leitenden Sinterkoerpern
DE1629952C3 (de) 1967-07-03 1974-02-28 Kurt 4000 Duesseldorf Krieger Strahlungsbrenner
FR94897E (fr) * 1966-04-06 1970-01-16 Krieger Kurt Bruleur, en particulier bruleur a rayonnement.
FR1595547A (fr) 1968-03-11 1970-06-15
US3695818A (en) 1969-10-31 1972-10-03 Rinnai Kk Radiant burner
US3751213A (en) 1971-11-19 1973-08-07 Du Pont High intensity radiant gas burner
DE3603387A1 (de) * 1986-02-05 1987-08-06 Kurt Krieger Verfahren zum betreiben eines gas-infrarotstrahlers und gas-infrarotstrahler
JPS645702U (fr) * 1987-06-27 1989-01-13
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249953A (en) * 1989-06-16 1993-10-05 Hercules Canada, Inc. Gas distributing and infrared radiating block assembly
DE29520108U1 (de) * 1995-12-19 1997-04-17 Robert Bosch Gmbh, 70469 Stuttgart Brenner für Heizgeräte
DE19901145A1 (de) * 1999-01-14 2000-07-20 Krieger Gmbh & Co Kg Als Flächenstrahler ausgebildeter Infrarot-Strahler
DE19928096A1 (de) * 1999-06-19 2000-12-21 Krieger Gmbh & Co Kg Gasbeheizter Infrarot-Strahler für eine Infrarot-Trocknungseinheit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009087126A2 (fr) * 2008-01-07 2009-07-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Corps thermorayonnant en céramique, sous forme de plaque, d'un émetteur plan infrarouge
WO2009087126A3 (fr) * 2008-01-07 2011-03-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Corps thermorayonnant en céramique, sous forme de plaque, d'un émetteur plan infrarouge

Also Published As

Publication number Publication date
US20050069830A1 (en) 2005-03-31
CA2475955A1 (fr) 2003-08-21
US7011516B2 (en) 2006-03-14
EP1476696A1 (fr) 2004-11-17

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